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A theory of intentionality is outlined, in which the desideratum that the intentional be the same as the real object is argued for in terms of an anti-realist ontology. According to such an ontology, an ordinary object is in itself an object of discourse taken as intentional when posited phenomenologically and as possible when posited naturalistically, i.e. as not existing in some possible worlds but as existing in others. If the actual world is included among the latter, the object deserves to be called "rear". Qua possible object, it answers to a principle of individuation which also works as a criterion of discrimination. According to such a principle, any possible object has a counterfactual individualising property which takes substance plus origin in a given spacetime as the object's essential properties, where it exists. It is, moreover, an object of discourse insofar as it generically depends, for its own being, on a singular term being publicly used to refer to it.

In the light of a sketch of the history of modem Anti-Metaphysics up from Francis Bacon Wittgenstein's position - the refusal of the possibility of metaphysical assertions - is compared with the views of Mach, of Camap and Neurath and of Popper. Analysing the notions of 'nonsense', 'meaninglessness' and 'Scheinproblem', their interrelations and connections to physicalism three variants of Anti-Metaphysics are distinguished: the Enlightenment view, the positivistMachian view and the linguistic Wittgensteinian view. The present day actuality of these views is evaluated and the conclusion drawn that the model of the cooperation between the different intellectual activities is more promising than the proscription of metaphysics.

In an attempt at fleshing out the thesis that religious (and other similar) experiences cannot be attributed to an individual on the basis of outer behaviour alone, the hypothesis is entertained of somebody who decides, at a certain point in his life, to fool everybody into beUeving that he is a reUgious beUever. This person, it is claimed, lacks the inner conviction that is crucial to religious experiences. Does this claim fall prey to Wittgenstein-like objections to the possibility of a private language? It is argued that it does not, by distinguishing between what counts empirically, and what conceptually, as a private language.

Frege's advances in the development of quantification have rarely been subjected to historical interpretation. While the characterization of existence as a second-order concept awaited the invention of the Begriffsschrift, important philosophical innovations had taken place since Kant's critique of the ontological argument. In particular, Herbart had re-conceptualized the nature of existential judgement and this was recognized and adopted by Brentano. In this light, thepossible influence of Herbart and Brentano (or their schools) upon Frege's work is elaborated and critically considered.

The paper presents and applies Hilbert's Epsilon Calculus, first describing its standard proof theory, and giving it an intensional semantics. These are contrasted with the proof theory of Fregean Predicate Logic, and the traditional (extensional) choice function semantics for the calculus. The semantics provided show that epsilon terms are referring terms in Donnellan's sense, enabling the symbolisation and validation of argument forms involving E-type pronouns, both in extensional and intensional contexts. By providing for transparency in intensional constructions they support a Model Conceptualism to contrast with traditional intensional logic's Modal Realism. But epsilon-terms also symbolise fictions, and through their difference from iota terms enable the solution of a number of outstanding puzzles about Direct Reference and de re beliefs.